ns2.it.com has no CNAME records.
Question and response
Question
dig ns2.it.com. NS
Answer
The response has no answer records.
Authority
it.com. 1797 SOA ns1.it.com. dns.cloudflare.com. 2397979929 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0